"At the time that I was questioned, I had even forgotten that I had taken
two photographs. I thought there was only one. I thought that there were
two identical pictures, but they turned out to be two different poses."
There were three poses. If she could put out of her mind the taking of two pictures, why not three?
Of course if someone is faking other photos and for no apparent reason, wouldn't they stop at one fake? More fakes increase the risk of detention (meaning professional, not armchair).
Referring to an exhibit showing 133-A and 133-B,
Mr. RANKIN. You took both of those pictures, did you, in Exhibit 133?
Mrs. OSWALD. Yes.
Marina did not know how to create a double exposure. She also never said she pressed the shutter button twice during one of the exposures.
Marina said Lee would set up the camera for her between exposures, including advancing the film for her.
133-A differs from B and C because it's the only one of the three where Oswald is in the fixed focal plane of the camera. He's further back (thereby defined with less resolution as well as less focus) in B and C.
Blue Ribbon Commission - 56 Years On and Findings Still Valid
Mr. THORNE. Exhibit 133 contains two photographs.
These are pictures of Lee Harvey Oswald with a rifle and pistol.
Mrs. OSWALD. For me at first they appeared to be one and the same, at first glance. But they are different poses.